[Zope] Authenticated user in Session onAdd methods?

Hello zopistas, I want to incluye some default values in a session data container when it instantiates. I created a python script that called when new session is created. The problem is hat I need to know the user name in order to setup the default session values. For example: sdo['UserName'] = <way to obtain the username> I tried: sdo['UserName'] = _.SecurityGetUser().getUserName() and the result is always "Anonymous User" even if I am logged as an authenticated user. Thanks. Juan Carlos Coruña jcoruna@ibdosnorte.com